In man, to be reported, there was natriuresis with weight loss, associated with the beginning of his fasting period. And it was suggested that adrenocortical androgen dehydroepiandrosterone (DNA) might play an important role in natriuresis induced by fasting. We investigated the rat's urinary excretion of sodium, potassium and DHA of the rats which were fasting with the injections of aldosterone 10 ag or DHA 5 mg/day. The rat plasma renin activity and renal renal renin contents were determined. The rat's excretions of sodium and potassium increased significantly at first day after rat's fasting, fasting with aldosterone and fasting with DHA injections, compared with the control rats. For the second, third and fourth days, the excretions of sodium and potassium decreased as it went by. All the rat plasma renin activity increased at fourth days after rat's fasting. The rat's DHA excretions of fasting and fasting with aldosterone injections were failed after the second day abruptly. Natriuresis of fasting could not cause in mineralcorticoid aldosterone and adrencortical androgen. DHA, for this two substances had never influences on the natriuresis of fasting in rat. The elevations of the rat plasma renin activity at the fourth days after fasting migh follow the changes of rat electrolyte levels by the rat's natriuresis of fasting. And it was obscure why the decreasing of the rat's DHAA excretions after the second fasting days were.
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